<template>
  <div class="cartcontrol">
    <transition>
      <div
        class="cart-decrease"
        v-show="food.count>0"
        @click="decreaseCart"
      ><span class="inner icon-remove_circle_outline"></span>
      </div>
    </transition>
    <transition name="count">
      <div class="cart-count" v-show="food.count>0">{{food.count}}</div>
    </transition>
    <div class="cart-add icon-add_circle" @click="addCart"></div>
  </div>
</template>

<script>
  import Vue from 'vue'
  export default {
    name: 'CartConTrol',
    props: {
      food: {
        type: Object
      }
    },
    methods: {
      addCart (event) {
        if (!event._constructed) {
          return
        }
        if (!this.food.count) {
          Vue.set(this.food, 'count', 1) // 通过Vue.set方法给food设置一个count属性
        } else {
          this.food.count++
        }
        this.$emit('cart-add', event.target)
      },
      decreaseCart (event) {
        if (!event._constructed) {
          return
        }
        if (this.food.count > 0) {
          this.food.count--
        }
      }
    }
  }
</script>

<style lang="stylus" scoped>
  .cartcontrol
    font-size 0
    .cart-decrease
      display inline-block
      padding 6px
      transition all 0.2s linear
      &.v-enter, &.v-leave-to
        opacity 1
        transform translate3d(0, 0, 0)
      .inner
        display inline-block
        line-height 24px
        font-size 24px
        transition all 0.2s linear
        color rgb(0, 160, 220)
        transform rotate(0)
      &.v-enter-active, &.v-leave-active
        opacity 0
        transform translate3d(24px, 0, 0)
        .inner
          transform rotate(240deg)
    .cart-add
      display inline-block
      padding 6px
      line-height 24px
      font-size 24px
      color rgb(0, 160, 220)
    .cart-count
      display inline-block
      vertical-align top
      width 12px
      padding-top 6px
      line-height 24px
      text-align center
      font-size 10px
      color rgb(147, 153, 159)
      &.count-enter, &.count-leave-to
        opacity 0
      &.count-enter-active, &.count-leave-active
        transition opacity 0.6s
</style>
